After you have migrated your existing content and/or re-built/designed a new page the question is "What do I do with my old content?"  For most people this means deleting the content.  Before you delete here are some of the things you should be thinking about.

1. Review the folder contents

Make sure you have reviewed the Folder Contents section on every folder and sub-folder - so you are not accidently deleting content.

2. Verify your migrated content

Test the new web pages and if you centralized your documentation ensure all your documents are there, organized properly and access levels are set.

3. Check twice, delete once

Once you select delete, you will be prompted with the message below.  Remember there is no recycle bin or restore option.

Best Practice

When in doubt - don't delete.  Change the Access setting to private and members and groups set to None.  Leave it that way for a couple of weeks to ensure that your migration was sucessful.